Leon Black’s Apollo Global Management is expected to announce as soon as Friday that it has signed a deal to buy Jack in the Box’s troubled Qdoba Mexican Eats chain, The Post has learned.

Apollo is expected to pay roughly $300 million for the 720-restaurant chain whose same-store sales fell 2.1 percent in the last quarter — and 1.5 percent in the most recent fiscal year.

At least one rival Qdoba suitor dropped out after the poor results were reported, a source said.

Jack shares fell 1.6 percent Thursday, to $102.67.

The San Diego company announced in May it was exploring strategic alternatives for Qdoba.

The Post reported exclusively Nov. 2 that Apollo was eyeing the No. 2 Mexican fast-food restaurant chain.

Apollo declined to comment.